Toothed gearing for steam-turbines.



B. LJUNGSTROM.

TOOTHED GEARING FOR STEAM TURBINESI APPLICATION FILED MAR. 14, 1913.

1,1 30,748. Patented Mar. 9, 191

WI TNESSES WM, MML

EMT

BIRGER. IJUNGSTRfiM, OF STOGKHOLM, SWEDEN, ASSIGNOR TO AKTIEBOLAGETLJUNGSTRfiMS ANGTURBIN, 0F LILJEHOLMEN, SWEDEN.

'I'OOTHED GEARIN G FOR STEAM-TURBINES.

Application filed March 14,

T all whom it may concern v Be it known that I, BIRGER LJUNGSTRiD'M, asubject of the King of Sweden, and a citizen of Sweden, residing at 18Grefmagnigatan, Stockholm, in the Kingdom of Sweden, have inventedcertain new and useful Improvements in. Toothed Gearings for Steam-Turbines, of which the following is a specification.

The present invention relates to a toothed gearing for steam-turbines ofthe double rotation type, having two shafts in the same axial line andespecially to those which have a high speed of rotation and are adaptedto drive propellers.

This invention relates especially to a known construction, in which thesaid two shafts drive two wheels on a common shaft by means of an evenand an odd number of toothed gear wheels and consists in arranging thewheels on the said common shaft so as to embrace a smaller centralwheel, which meshes with a wheel on the driven shaft. By thisarrangement a very concentrated and stable form of gearing is obtained.

An embodiment of the said invention is shown in Figures 1 and 2 of theaccompanying drawings in cross and longitudinal section respectively.

a indicates the turbine, which, in the embodiment, as shown is of'thedouble rotating type, so that the two shafts b and b rotate in oppositedirections. On these shafts toothed wheels 0, c are mounted, which meshwith the larger toothed wheels 7, f mounted on a common shaft e, thewheel 0 gearing directly with wheel 7", while wheel 0 is connected withwheel f by means of the intermediate wheel 03. The wheels f, willtherefore rotate in the same direction and with the same speed.

Between the wheels f, f smaller toothed Specification of Letters Patent.

' Patented Mar. 9, 1915. 1913. Serial No. 754,331.

wheels 9 g which are substantially a single one are mounted, said wheels9, g turning together and engaging the large toothed nature of my saidinvention what I claim 1s: v

In gearing for steam-turbines of the double rotating type, a pair ofshafts in the same axial line but rotating in opposite directions, apair of wheels respectively mounted on said shafts and turningtherewith, a shaft having two large wheels mounted thereon and turningtherewith, one of which wheels directly meshes with one of the pair ofwheelsfirst mentioned, an additional gear wheel transmitting motion fromthe other wheel of the first pair to the corresponding wheel of thesecond pair, a wheel smaller than those of the second pair arrangedbetween them on the same shaft to turn therewith, a driven shaft and awheel mounted thereon and turning therewith engaging said smaller wheeland arranged between and in proximity to the wheels of the second pair.

In testimony whereof I have affixed my signature in presence of twowitnesses.

BIRGER LJUNGsTRoM.

Witnesses GRETA PRICU, IRMA GRAAF.

